Interrelation of intrinsic and extrinsic defects - congruent, stoichiometric, and regularly ordered lithium niobate

Autor(en): Malovichko, G
Grachev, V
Schirmer, O
Stichwörter: CENTERS; DEPENDENCE; EDGE; GROWTH; IRON IONS; K2O; LINBO3 SINGLE-CRYSTALS; MELTS; OPTICAL-ABSORPTION; Optics; Physics; Physics, Applied
Erscheinungsdatum: 1999
Herausgeber: SPRINGER HEIDELBERG
Journal: APPLIED PHYSICS B-LASERS AND OPTICS
Volumen: 68
Ausgabe: 5
Startseite: 785
Seitenende: 793
Zusammenfassung: 
A new approach to the intrinsic and extrinsic defect subsystems, considering them as one integrated functional system, is developed for complex oxides. The strong interrelation of these subsystems becomes especially apparent when concentrations of both defect classes are comparable. A new parameter, reflecting the total intrinsic defect concentration, is introduced to determine the degree of crystal imperfection. The necessity of at least two calibrated samples - congruent and regularly ordered crystals - is substantiated. The accuracy by which the parameter can be determined can serve as a criterion in comparison of different methods of crystal characterisation. A procedure for crystal calibration by several physical characteristics is illustrated. Such a heuristic generalisation of the concept of mutual con-elation of the whole defect system and the material only became possible on the basis of experimental and theoretical study of large numbers of LiNbO3 crystals. The spectra of EPR, NMR, ENDOR, and other properties of crystals with different compositions, diverse modifiers (K, Mg,...), and various probe impurities have been analysed. It is found that crystals with vanishingly small concentration of intrinsic defects offer extraordinary informative opportunities. Their micro- and macroscopic properties are discussed. The developed ideas have a general character; therefore they should also be valid for other non-stoichiometric complex oxides.
ISSN: 09462171
DOI: 10.1007/s003400050705

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